...
@RequiredArgsContructor(onConstructor_ = {@Lazy})
Class A{
private final B b;
@Lazy
private final C c;
}
Class A{
private final B b;
private final C c;
A(B b,@Lazy C c){
this.b = b;
this.c = c;
}
}
Is it the same?
I want to use @Lazy with @RequiredArgsConstructor.
It's not the same. When you put @Lazy over constructor it leads to the creation of a lazy-resolution proxy for all affected dependencies, i.e. in your first case both b and c injected into constructor are resolved lazily.
In the second case only c is resolved lazily.
See Is using `@Lazy` on a component constructor equal to annotating every argument?
I want to using @Lazy with @RequiredArgsConstructor
Use your first approach.
P.S. Btw, having @Lazy over constructor in the first case makes redundant @Lazy over private final C c;.
As @Sergey said, it's not the same, it affects all dependencies.
Referring to Mafor's answer:
You can configure Lombok to copy the
@Lazyannotation from the field to the constructor's parameter.
Create lombok.config file in the project's root and add the following line:
lombok.copyableAnnotations += org.springframework.context.annotation.Lazy
Then you can define your class as follows:
@RequiredArgsContructor
Class A{
private final B b;
@Lazy
private final C c;
}